these 5 derivations will be built:
  /nix/store/x35720v4ij6wdbmxydghpzzm4z20wplq-source.drv
  /nix/store/mzjqy24ixsjij21sg6774rc7kyjx9ahj-but-0.23.3-vendor-staging.drv
  /nix/store/1p0arr6sv14zmhzvna5ahlnkh37gwfp8-but-0.23.3-vendor.drv
  /nix/store/nd4xjaz4j9lrmsq5dfyfnqpsiyb37hai-but-0.23.3.drv
  /nix/store/fhzi89mqmb5phg39wpqhfclm8v224ziq-check-but.drv